Improvement in exf ension-ladders



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Letters Patent No. 113,273, dated April 4, 1871'.

IMPRQVEMENT IN. EXTENSION-LADDERS.

The Schedule referred to in these Letters Patent and making part ol' the same.

To all whom 'it may concern:

Be it known that I, RENSELAER F. DELMom, of Flemington, in the county of Clinton and State ofv Pennsylvania, have invented a new and useful Improvement in Extension-Ladders; and I do hereby declare that the following is a full, clear, andexact description thereof, which will enable others skilled in the art to make and use the same, reference being had to ythe accompanying drawing forming part of this specification.

This invention relates to improvements in extension-ladders; and consists in jointingA the sections together by means of trunnions on the one section, ar-

' ranged in angle-plates attached to the other section,

having right-angled slots, and arranged so that one part ol'the slot is parallel with the bars of the section to which the said plates are^ attached; and the other parts are perpendicular thereto andto the rods connecting the bars, so that one section may swing on the other and slide up and down on it.

lt also consists in an arrangement of yokes on the bars of each section, so that, when the two sections are slid together, the ends oi' one will be engaged in the yokes of the other, in a manner to be held rigidly lin the extended position. Y

The invention alsocompm'ses `certain adjnncts to the said ladder, all as hereinafter described.

-Figure l is a front elevation of my improved ladder.

Figure 2 is a sectional elevation ofthe same.

Figure 3 is a side elevation, showing how the ladder may be folded up and used for a sca'old, and

Figure 4 is a sectional elevation, showing how it may be arranged for a'step-ladder.

Similar letters of reference indicate corresponding parts.

A represents the side rails of a lower section, and

B the rails of an upper one.

G are the bands .or yokes on the lower rails, near the upper ends, for the/reception of the lower ends of the rails B.

D are the yokes of the rails B, near the lower ends, for the reception-of the upper ends of A.`

The yokes C project inside the rails A the thickness of rails B; the yokes D- project outward from the rails B the thickness of rails A so that, the section B, being as much narrower than A as required for it to slide between the rails A, the ends of each part will be received into the yokes of the other when the one is slid into the other.

The bars A have the angle-plates F let into them l at the inner sides, near the upper ends, flush with the surfaces, as shown, which plates have the angular slots H I so arranged that the parts H are parallel with Vthe bars A, and the parts I perpendicular to the cross# bars L.

'The upper section is provided with the stud-pins or trunnions M, which are ittedin the slots of plates The plates may be on the uppers'ections and the studpins on the lower one, if preferred.

, It will be seen that, when the sections are arranged in a right line, and slid together so 'that the studpins M are moved to the bottoms of the slots H, the side-bars will be engaged with the yokes, so as to be held very rigidly in the extended position 5; but, wh en slided the other way, and the stud-pins brought up into the parts I of the slots, the ends of the side rails will be disengaged from the yokes, and the sections may be folded over'on veach other, in a very compact form, for storage or transportation, the said slots I permitting the necessary lateral movement of one section `with the other at the joints; or, they may be arranged, as represented in lig. 3, for use as a scaffold, each end'of' which is a ladder; or, again, being arranged as shown in tig. 4, it may serve as "astep-ladder, and, in this position, it may have a wheel, N, attached to one end of each of the bottom side rails by a yoke, O,

to be rolled along the ground for moving from place to place, the other ends being raisedby the operators.

In this latter position it may have a tool-box, P, mounted on it, as shown. for moving with it, said toolbox having the pieces Q attached, one at each end and at the back, so that, when the latter rests against the side rails of the *middle section, above the yokes D` thereof, theywill extend into the latter and hold the box in place.

I prefer to employ three sections iu one ladder, but may have more or less.

Having thus described my invention, l v

I claim as new and desire to secure by Letters Patentl, The combination of two or more sections of' a ladder', the yokes G D, the slotted angle-plates Ill, and the stud-pins M, all substantially as specified.

2. The combination, with the rails A, of the wheels N and-yokes O, substantially as speeilied.

The combination, with the rails B andl yokes D, ofthe tool-box P, when provided with the pieces Q, all substantially as specified.l

Witnesses:

'SonosT Woon,

JACOB SLnxKnn.

RENSELAER F. DELMOT. 

